Yes, yes, you are the most powerful man in the world. And yes, you own the green and everything around it at Trump National Golf Club in Bedminster, New Jersey, one of 17 golf courses around the world that carries your name. Still, sir: a golf cart? On the green? Just weeks before the U.S. Women’s Open? Why, it’s the golf etiquette equivalent of putting ketchup on a well-done steak!

(For the non-golfers: running the thick tires of a heavy cart over a green can put trenches in the delicate grass, making it tougher for the people following behind you to putt and ruining the hard work of the maintenance crews. It’s a breach of decorum that has gotten people evicted and banned from golf courses … ones they don’t themselves own, of course.)

Anyway, look. It is his course, and he can do what he wishes. This is golf, after all, not national security. And all you need to do is listen to his cheery banter with the bros filming this to see a measure of his appeal to the everyman. But still: if this leads to an epidemic of golfers driving their carts onto the green, well … this might be the move that turns some of the president’s most golf-avid supporters against him.